linux-kernel - Re: [PATCH] net: hsr : Provide fix for HSRv1 supervisor frames decoding

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Message-ID: <20230905080614.ImjTS6iw@linutronix.de>
Date:   Tue, 5 Sep 2023 10:06:14 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Lukasz Majewski <lukma@...x.de>
Cc:     Tristram.Ha@...rochip.com, Eric Dumazet <edumazet@...gle.com>,
        davem@...emloft.net, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kristian Overskeid <koverskeid@...il.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andreas Oetken <ennoerlangen@...il.com>
Subject: Re: [PATCH] net: hsr : Provide fix for HSRv1 supervisor frames
 decoding

On 2023-08-25 17:31:11 [+0200], Lukasz Majewski wrote:
> Provide fix to decode correctly supervisory frames when HSRv1 version of
> the HSR protocol is used.
> 
> Without this patch console is polluted with:
> ksz-switch spi1.0 lan1: hsr_addr_subst_dest: Unknown node
> 
> as a result of destination node's A MAC address equals to:
> 00:00:00:00:00:00.
> 
> cat /sys/kernel/debug/hsr/hsr0/node_table
> Node Table entries for (HSR) device
> MAC-Address-A,    MAC-Address-B,    time_in[A], time_in[B], Address-B
> 00:00:00:00:00:00 00:10:a1:94:77:30      400bf,       399c,	        0
> 
> It was caused by wrong frames decoding in the hsr_handle_sup_frame().
> 
> As the supervisor frame is encapsulated in HSRv1 frame:
> 
> SKB_I100000000: 01 15 4e 00 01 2d 00 10 a1 94 77 30 89 2f 00 34
> SKB_I100000010: 02 59 88 fb 00 01 84 15 17 06 00 10 a1 94 77 30
> SKB_I100000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> SKB_I100000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> SKB_I100000040: 00 00
> 
> The code had to be adjusted accordingly and the MAC-Address-A now
> has the proper address (the MAC-Address-B now has all 0's).

Was this broken by commit
	eafaa88b3eb7f ("net: hsr: Add support for redbox supervision frames")

? Is this frame somehow special? I don't remember this…

> Signed-off-by: Lukasz Majewski <lukma@...x.de>

Sebastian